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制作一个带有ssh的镜像

FROM centos:7
RUN yum install -y openssh-server openssh-clients sudo
RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config

RUN useradd hadoop
RUN echo "hadoop:hadoop" | chpasswd
RUN echo "hadoop   ALL=(ALL)       NOPASSWD:ALL" >> /etc/sudoers
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key
RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ""
# 启动sshd服务并且暴露22端口
RUN mkdir /var/run/sshd

##加上此内容则是Hadoop账号免密登陆，hadoop需要
RUN chmod -R 755 /etc/ssh/ 

##加上此内容则是Hadoop账号免密登陆，hadoop需要
RUN chmod +s /usr/sbin/sshd  

##加上此内容则是Hadoop账号免密登陆，hadoop需要
USER hadoop

RUN ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa 
RUN cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys  
EXPOSE 22 
ENTRYPOINT ["/usr/sbin/sshd","-D"]

docker build -t centos7-ssh:v1 .